I printed my taxes to file by mail but now I’d like to efile. How can I do this?

As long as you haven't already mailed your 2019 paper return, you can switch to the e-filing method (through October 15, 2020).

However, some states now require e-filing, which means the federal and state must be e-filed together.

To change from mailing to e-filing your returns, follow these steps:

1. In TurboTax Online, sign into your account.
2. Select Tax Home in the left menu.
3. Scroll down to Your tax returns & documents.
4. Select 2019, and then select Add a State (you're not actually adding a state, this just gets you into the right area).
5. Select File in the left menu (expand your browser window if you don't see this, or select the menu icon in the top left corner).
6. On the Just one more step screen, follow steps 1 and 2 if you haven't already.
7. Select the Start button to the right of Step 3.
8. On the Let's get ready to e-file screen, select I want to e-file.
9. Follow the instructions to e-file your return.

Source: TurboTax FAQ